165721848 has 48 divisors (see below), whose sum is σ = 440127480. Its totient is φ = 51988992.

The previous prime is 165721847. The next prime is 165721861. The reversal of 165721848 is 848127561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165721841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5011 + ... + 18882.

Almost surely, 2^165721848 is an apocalyptic number.

It is an amenable number.

165721848 is an abundant number, since it is smaller than the sum of its proper divisors (274405632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165721848 is a wasteful number, since it uses less digits than its factorization.

165721848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23936 (or 23915 counting only the distinct ones).

The product of its digits is 107520, while the sum is 42.

The square root of 165721848 is about 12873.2998100720. The cubic root of 165721848 is about 549.2793293886.

The spelling of 165721848 in words is "one hundred sixty-five million, seven hundred twenty-one thousand, eight hundred forty-eight".